This adds logic for taking SDM_DIN (Sigma Delta Modulator) setting into
the equation to calculate the effective N value for PLL which supports
fractional divider.

The effective N = NDIV + 1/2 + SDM_DIN/2^13, where NDIV is the integer
feedback divider.
Reviewed-by: NBenson Leung <bleung@chromium.org>
Signed-off-by: NRhyland Klein <rklein@nvidia.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>